.curved-corner{width:45px;height:45px;overflow:hidden;position:relative;display:inline-block;background-color:transparent}.curved-corner:before{content:"";display:block;width:200%;height:200%;position:absolute;border-radius:30%}#curved-corner-bottomleft:before{bottom:0;left:0;box-shadow:-50px 50px 0 0 #fff}#curved-corner-bottomright:before{bottom:0;right:0;box-shadow:50px 50px 0 0 #fff}#curved-corner-topleft:before{top:0;left:0;box-shadow:-50px -50px 0 0 #fff}#curved-corner-topright:before{top:0;right:0;box-shadow:50px -50px 0 0 #fff}